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40 votes
40 votes
What is the measure of B?

Select the best answer from the choices provided.
A.33°
B. 57
C. 770
D.123

What is the measure of B? Select the best answer from the choices provided. A.33° B-example-1
User Chanckjh
by
2.7k points

2 Answers

28 votes
28 votes

The angle sum property of a triangle:

  • The total measure of the three angles of a triangle is 180°

∠A + ∠B + ∠C = 180°

  • ∠A = 58°
  • ∠B = 65°
  • ∠C = x

⇛58° + 65° + x = 180°

⇛123° + x = 180°

⇛x = 180° - 123°

⇛x = 57°

Option B is the correct answer

User Williette
by
3.4k points
5 votes
5 votes

Answer:

B =57

Explanation:

The sum of the angles of a triangle is 180

A+B+C = 180

58+B+65 = 180

123+B = 180

B = 180-123

B =57

User Rvnovaes
by
2.9k points